Léopold Leau

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Léopold Leau

Léopold Leau ( April 6, 1868 -  December 28, 1943 ) was a French mathematician .

Leau studied at the École normal supérieure in Paris and received his doctorate there in April 1897. He was later a professor at the University of Nancy . There he was dean of the Faculté des Sciences from 1931–34.

In his dissertation, Leau examined, among other things, the iteration behavior of holomorphic functions in the vicinity of a rationally indifferent fixed point. His results are known today under the name (Leau-Fatou) Flower Theorem . They play an important role in the complex dynamics .

Leau initiated the delegation to adopt an international auxiliary language on January 17, 1901 and subsequently became involved in planned languages . With Louis Couturat he wrote a history of universal languages.

literature

  • Daniel S. Alexander: A history of complex dynamics: from Schröder to Fatou and Julia. (Aspects of Mathematics), Vieweg, Braunschweig 1994, ISBN 3-528-06520-6 . Chapter 5 describes Leau's contributions.
  • Michèle Audin: Fatou, Julia , Montel , le grand prix des sciences mathématiques de 1918, et après… Springer, 2009, ISBN 978-3-642-00445-2 . (French); English translation: Michèle Audin: Fatou, Julia, Montel, The Great Prize of Mathematical Sciences of 1918, and Beyond . Springer, 2011, ISBN 978-3-642-17853-5 .

Individual evidence

  1. ↑ The dissertation Étude sur les équations fonctionnelles à une ou à plusieurs variables appeared in: Annales de la Faculté des sciences de Toulouse: Mathématiques, Série 1, Volume 11 (1897), Issue 2, pages E.1-E.110. Digitized at Numdam: Part 1 , Part 2
  2. ↑ Alexander, page 67.
  3. ↑ see Henry Jacob: A planned auxiliary language . D. Dobson Ltd., London, 1947; Excerpts online at interlanguages.net
  4. ↑ Louis Couturat, Léopold Leau: Histoire de la langue universelle . Hachette, Paris, 1903; Digitized at Gallica; Addition Les nouvelles langues internationales: Suite à L'histoire de la langue universelle , Paris, 1907.
personal data
SURNAME Leau, Léopold
BRIEF DESCRIPTION French mathematician
DATE OF BIRTH April 6, 1868
DATE OF DEATH December 28, 1943